Ok, whats the scoop on the 10 hour service on the Yamaha (4 stroke)wave runners. I know it consists of an oil change. Ive called three dif service depts to get an idea on cost and time, From 148.00 to 260.00 and was told by one they replace plugs at a every service interval. Now being a drivability technician for Gm Im wondering why the charge of 2 labor hours for this service. And the change of plugs? Also if I decide to change the oil and filter myself will the warr be crap.. Thanks for any info on this..